Elizabeth, rambling in the park, often meets Darcy unexpectedly.
On these occasions, he walks with her and asks odd questions
about her likes and dislikes. Once she meets Fitzwilliam while
she is strolling, and they speak of Darcy. Fitzwilliam tells her
that recently Darcy has saved a friend from an unwise marriage,
and he suspects this friend to be Bingley. Elizabeth is pained
over hearing the news. She is furious with Darcy for ruining her
sister’s life. She later feigns a headache so she will not have to
accompany the others to Rosings; angry with Darcy for his
interference in Jane’s life, she does not want to see him.

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Notes

When she strolls in the park, Elizabeth sometimes encounters
Fitzwilliam or Darcy, who walk with her. It is obvious that
Fitzwilliam adores Elizabeth; but he cannot contemplate
marrying her, for as the younger son, he has neither wealth nor
property to offer.

The mystery of Bingley’s abrupt departure from Netherfield is
solved. Colonel Fitzwilliam unknowingly tells Elizabeth that
Darcy has stopped a friend, probably Bingley, from an unwise
marriage. Elizabeth is agitated over the news and hates Darcy as
never before for meddling in Jane's life. It is a part of Austen’s
dramatic stratagem that Darcy’s proposal should follow
immediately after this revelation.